//---------------------------------------------------------------------------
//	Greenplum Database
//	Copyright (C) 2012 EMC Corp.
//
//	@filename:
//		CParseHandlerColStatsBucket.h
//
//	@doc:
//		SAX parse handler class for parsing a bucket of a column stats object
//---------------------------------------------------------------------------

#ifndef GPDXL_CParseHandlerColStatsBucket_H
#define GPDXL_CParseHandlerColStatsBucket_H

#include "gpos/base.h"
#include "naucrates/dxl/parser/CParseHandlerMetadataObject.h"

// fwd decl
namespace gpmd
{
	class CMDIdColStats;
	class CDXLBucket;
}

namespace gpdxl
{
	using namespace gpos;
	using namespace gpmd;
	using namespace gpnaucrates;

	XERCES_CPP_NAMESPACE_USE

	// fwd decl
	class CDXLDatum;

	//---------------------------------------------------------------------------
	//	@class:
	//		CParseHandlerColStatsBucket
	//
	//	@doc:
	//		Parse handler class for buckets of column stats objects
	//
	//---------------------------------------------------------------------------
	class CParseHandlerColStatsBucket : public CParseHandlerBase
	{
		private:
		
			// frequency
			CDouble m_frequency;
			
			// distinct values
			CDouble m_distinct;

		// lower bound value for the bucket
			CDXLDatum *m_lower_bound_dxl_datum;
			
		// upper bound value for the bucket
			CDXLDatum *m_upper_bound_dxl_datum;
			
			// is lower bound closed
			BOOL m_is_lower_closed;

			// is upper bound closed
			BOOL m_is_upper_closed;

			// dxl bucket object
		CDXLBucket *m_dxl_bucket;
			
			// private copy ctor
			CParseHandlerColStatsBucket(const CParseHandlerColStatsBucket&);

			// process the start of an element
			void StartElement
				(
				const XMLCh* const element_uri, 		// URI of element's namespace
 				const XMLCh* const element_local_name,	// local part of element's name
				const XMLCh* const element_qname,		// element's qname
				const Attributes& attr				// element's attributes
				);

			// process the end of an element
			void EndElement
				(
				const XMLCh* const element_uri, 		// URI of element's namespace
				const XMLCh* const element_local_name,	// local part of element's name
				const XMLCh* const element_qname		// element's qname
				);

		public:

			// ctor
			CParseHandlerColStatsBucket
				(
				CMemoryPool *mp,
				CParseHandlerManager *parse_handler_mgr,
				CParseHandlerBase *parse_handler_base
				);
			
			// dtor
			virtual
			~CParseHandlerColStatsBucket();
			
			// returns the constructed bucket
			CDXLBucket *GetDXLBucketAt() const;
	};
}

#endif // !GPDXL_CParseHandlerColStatsBucket_H

// EOF
